如图，我用 A 方法和 B 方法都提示冲突

前提: green view 必须有高度约束的 50

A布局中:
red 距离 super view top 10
green 距离 red view top 10
green 距离 super view bottom 20

此时提示 green 冲突了，不能同时满足 height 和 距离 super view bottom 20

B布局中：
red 距离 super view top 10
green 距离 red view top 10
purple 距离 green view top 0
purple 距离 super view bottom 20

此时还是提示冲突，怎么满足 green view 必须有高度约束呢?

相关代码

 titleLabel.autoPinEdgeToSuperviewEdge(ALEdge.Top, withInset: verticalInsets)
        titleLabel.autoPinEdgeToSuperviewEdge(ALEdge.Left, withInset: horizontalInsets)
        titleLabel.autoPinEdgeToSuperviewEdge(ALEdge.Right, withInset: horizontalInsets)

        dateLabel.autoPinEdgeToSuperviewEdge(ALEdge.Left, withInset: horizontalInsets)
        dateLabel.autoPinEdge(ALEdge.Top, toEdge: ALEdge.Bottom, ofView: titleLabel, withOffset: verticalInsets / 2)

        coverImage.autoPinEdge(ALEdge.Top, toEdge: ALEdge.Bottom, ofView: dateLabel, withOffset: verticalInsets)
        coverImage.autoPinEdgeToSuperviewEdge(ALEdge.Left, withInset: horizontalInsets)
        coverImage.autoPinEdgeToSuperviewEdge(ALEdge.Right, withInset: horizontalInsets)
        coverImage.autoSetDimension(ALDimension.Height, toSize: screenWidth * 0.5597014925)

        bottomGap.autoPinEdge(ALEdge.Top, toEdge: ALEdge.Bottom, ofView: coverImage)
        bottomGap.autoPinEdgeToSuperviewEdge(ALEdge.Bottom, withInset: verticalInsets)

这是一个 uitableviewcell 的布局，bottom也必须要有 Pin，否则自动检测高度无效。